Intercomparison of the NCEP/NCAR and the NASA/DAO
Reanalyses (1985-1993)

4. Comparisons

List of Figures

4.1 Zonal Mean Fields

Figure 3. Time-latitude sections of the 200-hPa zonal mean u-wind
in (a) the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO).
In (a) and (b) the contour interval is 5 m s-1 and in (c) the
contour interval is 1 m s-1. The negative values are shaded.

Figure 4. Time-latitude sections of the 200-hPa zonal mean v-wind
in (a) the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO).
In (a) and (b) the contour interval is 0.5 m s-1 and in (c) the
contour interval is 0.3 m s-1. The negative values are shaded.

Figure 5. Time-latitude sections of the 500-hPa zonal mean height
field in (a) the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO).
In (a) and (b) the contour interval is 100 m and in (c) the contour
interval is 10 m.

Figure 6. Latitude-pressure sections of zonal mean u-wind for
DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is 5 m s-1 and
in (c) the contour interval is 0.5 m s-1. The negative values
are shaded.

Figure 7. Standard deviation of the zonal mean u-wind within
DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The
contour interval is 0.5 m s-1. Values greater than 2 m s-1 are
shaded.

Figure 8. Latitude-pressure sections of zonal mean u-wind for
JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is 5 m s-1 and
in (c) the contour interval is 0.5 m s-1. The negative values
are shaded.

Figure 9. Standard deviation of the zonal mean u-wind within
JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The
contour interval is 0.5 m s-1. Values greater than 2 m s-1 are
shaded.

Figure 10. Latitude-pressure sections of zonal mean v-wind for
DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). The contour interval is 0.5 m s-1. The negative
values are shaded.

Figure 11. Standard deviation of the zonal mean v-wind for
DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The
contour interval is 0.1 m s-1. Values greater than 0.2 m s-1
are shaded.

Figure 12. Latitude-pressure sections of zonal mean v-wind for
JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). The contour interval is 0.5 m s-1. The negative
values are shaded.

Figure 13. Standard deviation of the zonal mean v-wind within
JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The
contour interval is 0.1 m s-1. Values greater than 0.2 m s-1
are shaded.

Figure 14. Latitude-pressure sections of zonal mean temperature
for DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is
10 K and in (c) the contour interval is 1 K. In (c) the negative
values are shaded.

Figure 15. Standard deviation of the zonal mean temperature
for DJF 85-93 from (a) the NCEP, and (b) the DAO. The contour interval
is 0.2 K. Values greater than 1 K are shaded.

Figure 16. Latitude-pressure sections of zonal mean temperature
for JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is
10 K and in (c) the contour interval is 1 K. In (c) the negative
values are shaded.

Figure 17. Standard deviation of the zonal mean temperature within
JJA 85-93 from (a) the NCEP, and (b) the DAO. The contour interval
is 0.2 K. Values greater than 1 K are shaded.

Figure 18. Latitude-pressure sections of zonal mean vertical
velocity for DJF 85-93 from (a) the NCEP, (b) the DAO, and (c)
the difference (NCEP-DAO). The contour interval is 5x10-3 Pa
s-1. The negative values are shaded.

Figure 19. Standard deviation of the zonal mean vertical velocity
within DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB.
Pa s-1 are shaded.

Figure 20. Latitude-pressure sections of zonal mean vertical
velocity for JJA 85-93 from (a) the NCEP, (b) the DAO, and (c)
the difference (NCEP-DAO). The contour interval is 5x10-3 Pa
s-1. The negative values are shaded.

Figure 21. Standard deviation of the zonal mean vertical velocity
within JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB.
The contour interval is 1x10-3 Pa s-1. Values greater than 3x10-3
Pa s-1 are shaded.

Figure 22. Latitude-pressure sections of zonal mean specific
humidity for DJF 85-93 from (a) the NCEP, (b) the DAO, and (c)
the difference (NCEP-DAO). In (a) and (b) the contour interval
is 1 g kg-1 and in (c) the contour interval is 0.2 g kg-1.

Figure 23. Standard deviation of the zonal mean specific humidity
within DJF 85-93 from (a) the NCEP and (b) the DAO. The contour
interval is 0.05 g kg-1. Values greater than 0.2 g kg-1 are shaded.

Figure 24. Latitude-pressure sections of zonal mean specific
humidity for JJA 85-93 from (a) the NCEP, (b) the DAO, and (c)
the difference (NCEP-DAO). In (a) and (b) the contour interval
is 1 g kg-1 and in (c) the contour interval is 0.2 g kg-1.

Figure 25. Standard deviation of the zonal mean specific humidity
within JJA 85-93 from (a) the NCEP and (b) the DAO. The contour
interval is 0.05 g kg-1. Values greater than 0.2 g kg-1 are shaded.

4.2 Global Fields

Figure 26. 200-hPa u-wind for DJF 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 5 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 27. Standard deviation of the 200-hPa u-wind within DJF
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1 (starting from 3.0 m s-1). Values greater
than 4 m s-1 are shaded.

Figure 28. 850-hPa u-wind for DJF 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 3 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 29. Standard deviation of the 850-hPa u-wind within DJF
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1. Values greater than 2 m s-1 are shaded.

Figure 30. 200-hPa u-wind for JJA 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 5 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 31. Standard deviation of the 200-hPa u-wind within JJA
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1 (starting from 3.0 m s-1). Values greater
than 4 m s-1 are shaded.

Figure 32. 850-hPa u-wind for JJA 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 3 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 33. Standard deviation of the 850-hPa u-wind within JJA
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1. Values greater than 2 m s-1 are shaded.

Figure 34. 200-hPa v-wind for DJF 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 2 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 35. Standard deviation of the 200-hPa v-wind within DJF
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1. Values greater than 3 m s-1 are shaded.

Figure 36. 850-hPa v-wind for DJF 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 2 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 37. Standard deviation of the 850-hPa v-wind within DJF
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 0.5 m s-1 (starting from 1.0 m s-1). Values greater
than 2 m s-1 are shaded.

Figure 38. 200-hPa v-wind for JJA 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 2 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 39. Standard deviation of the 200-hPa v-wind within JJA
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 1.0 m s-1. Values greater than 3 m s-1 are shaded.

Figure 40. 850-hPa v-wind for JJA 85-93 from (a) the NCEP, (b)
the DAO, and (c) the difference (NCEP-DAO). In (a) and (b) the
contour interval is 2 m s-1 and in (c) the contour interval is
1 m s-1 and the zero contour is omitted for clarity. The negative
values are shaded.

Figure 41. Standard deviation of the 850-hPa v-wind within JJA
85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB. The contour
interval is 0.5 m s-1. Values greater than 2 m s-1 are shaded.

Figure 42. 500-hPa eddy (deviation from the zonal mean) height
field for DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the
difference (NCEP-DAO). In (a) and (b) the contour interval is
30 m and in (c) the contour interval is 10 m. The negative values
are shaded.

Figure 43. Standard deviation of the 500-hPa eddy (deviation
from the zonal mean) height field within DJF 85-93 from (a) the
NCEP, (b) the DAO, and (c) the CDDB. The contour interval is
5 m . Values greater than 30 m are shaded.

Figure 44. 500-hPa eddy (deviation from the zonal mean) height
field for JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the
difference (NCEP-DAO). In (a) and (b) the contour interval is
30 m and in (c) the contour interval is 10 m. The negative values
are shaded.

Figure 45. Standard deviation of the 500-hPa eddy (deviation
from the zonal mean) height field within JJA 85-93 from (a) the
NCEP, (b) the DAO, and (c) the CDDB. The contour interval is
5 m . Values greater than 30 m are shaded.

Figure 46. 200-hPa eddy (deviation from the zonal mean) streamfunction
for DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is 5x106 m2 s-1
and in (c) the contour interval is 1x106 m2 s-1.

Figure 47. Standard deviation of the 200-hPa eddy (deviation
from the zonal mean) streamfunction within DJF 85-93 from (a)
the NCEP, (b) the DAO, and (c) the CDDB. The contour interval
is 1x106 m2 s-1 . Values greater than 4x106 m2 s-1 are shaded.

Figure 48. 200-hPa eddy (deviation from the zonal mean) streamfunction
for JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the difference
(NCEP-DAO). In (a) and (b) the contour interval is 5x106 m2 s-1
and in (c) the contour interval is 1x106 m2 s-1.

Figure 49. Standard deviation of the 200-hPa eddy (deviation
from the zonal mean) streamfunction within JJA 85-93 from (a)
the NCEP, (b) the DAO, and (c) the CDDB. The contour interval
is 1x10 6 m2 s-1 . Values greater than 4x10 6 m2 s-1 are shaded.

Figure 50. 200-hPa velocity potential for DJF 85-93 from (a)
the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). In
(a) and (b) the contour interval is 1x106 m2 s-1 and in (c) the
contour interval is 0.5x106 m2 s-1.

Figure 51. Standard deviation of the 200-hPa velocity potential
within DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB.
The contour interval is 0.2x106 m2 s-1. Values greater than
2x106 m2 s-1 are shaded.

Figure 52. 850-hPa velocity potential for DJF 85-93 from (a)
the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). In
(a) and (b) the contour interval is 1x106 m2 s-1 and in (c) the
contour interval is 0.3x106 m2 s-1.

Figure 53. Standard deviation of the 850-hPa velocity potential
within DJF 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB.
The contour interval is 0.2x106 m2 s-1. Values greater than
1x106 m2 s-1 are shaded.

Figure 54. 200-hPa velocity potential for JJA 85-93 from (a)
the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). In
(a) and (b) the contour interval is 1x106 m2 s-1 and in (c) the
contour interval is 0.5x106 m2 s-1.

Figure 55. Standard deviation of the 200-hPa velocity potential
within JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the CDDB.
The contour interval is 0.2x106 m2 s-1. Values greater than
2x106 m2 s-1 are shaded.

Figure 56. 850-hPa velocity potential for JJA 85-93 from (a)
the NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). In
(a) and (b) the contour interval is 1x106 m2 s-1 and in (c) the
contour interval is 0.3x106 m2 s-1.

Figure 57. Standard deviation of the 850-hPa velocity potential
within JJA 85-93 from (a) the NCEP, (b) the DAO, and (c) the
CDDB. The contour interval is 0.2x106 m2 s-1. Values greater
than 1x106 m2 s-1 are shaded.

Figure 58. Mean sea-level pressure for DJF 85-93 from (a) the
NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). The contour
intervals are: (a) 4 hPa, (b) 4 hPa and (c) 2 hPa. In (a) and
(b) the values greater than 1020 hPa are shaded and in (c) the
negative values are shaded.

Figure 59. Standard deviation of the mean sea-level pressure
within DJF 85-93 from (a) the NCEP, and (b) the DAO. The contour
interval is 1 hPa. Values greater than 3 hPa are shaded.

Figure 60. Mean sea-level pressure for JJA 85-93 from (a) the
NCEP, (b) the DAO, and (c) the difference (NCEP-DAO). The contour
intervals are: (a) 4 hPa, (b) 4 hPa and (c) 2 hPa. In (a) and
(b) the values greater than 1020 hPa are shaded and in (c) the
negative values are shaded.

Figure 61. Standard deviation of the mean sea-level pressure
within JJA 85-93 from (a) the NCEP, and (b) the DAO. The contour
interval is 1 hPa. Values greater than 3 hPa are shaded.

Figure 64. Standard deviation of the total precipitable water
within DJF (Dec 87 - Jan 92) from (a) the NCEP, (b) the DAO, and
(c) the SSM/I. The contour interval is 2 kg m-2. Values greater
than 2 kg m-2 are shaded.

Figure 67. Standard deviation of the total precipitable water
within JJA (Jul 87 - Aug 91) from (a) the NCEP, (b) the DAO, and
(c) the SSM/I. The contour interval is 2 kg m-2. Values greater
than 2 kg m-2 are shaded.